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https://issues.apache.org/jira/browse/YARN-9121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775469#comment-16775469
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Szilard Nemeth commented on YARN-9121:
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[~sunilg]: Sure, {{new GpuDiscoverer()}} only happens once in the production
code and that single instance is used everywhere.
> Users of GpuDiscoverer.getInstance() are not possible to test as instance is
> a static field
> -------------------------------------------------------------------------------------------
>
> Key: YARN-9121
> URL: https://issues.apache.org/jira/browse/YARN-9121
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Szilard Nemeth
> Assignee: Szilard Nemeth
> Priority: Major
> Attachments: YARN-9121.001.patch
>
>
> The clients of GpuDiscoverer are very hard to test as they call
> GpuDiscoverer.getInstance() internally.
> For example, writing tests for
> org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu.GpuResourcePlugin#getNMResourceInfo
> is quite hard as the GpuDeviceInformation returned by GpuDiscoverer is not
> interchangeable as GpuDiscoverer is not mockable since we cannot inject it in
> tests.
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